Abstract:
Control Allocation (CA) is one of the reconfiguration approaches to manage
actuator redundancy in over actuated systems in an effective way, so that the fault
tolerance can be achieved. There is a wide range of algorithms and approaches
which include linear as well as quadratic programming-based CA schemes. Such
schemes can deal with constraints on the control input, but these methods cannot
be represented in explicit form.Reliability is an important property in Fault
Tolerant Control domain and managing redundant actuators optimally plays a vital
role to achieve this goal. In this thesis to handle the issue happening in actuators
channels through Integral sliding mode FTC scheme by taking advantage of
redundant actuators through online control allocation scheme designed for
Propulsion Control application, (where only the engines thrust is available) for a
safe landing. It is presumed that the health information of actuators is available for
the proposed FTC scheme. Here, both lateral and longitudinal models of a large
airplane are considered to design separate controller for each modes of operation.
The viability level of the actuators is utilized by the control distribution conspire
to reallocate the control signs to adjust engines push whenever actuators-failures
happens without reconfiguring the controller. The main objective in this thesis is
safe landing when system is totally dependent upon engines thrust. The
effectiveness of the proposed propulsion control scheme against deficiencies is
tried in simulations using MATLAB in view of an enormous vehicle airplane
model. The basic purpose to design this scheme is emergency safe landing in case
of total hydraulic failures. The proposed scheme using online control allocation is
compared with direct control allocation to show its effectiveness.
